Eccentric chuck.



P. A. WBNNERSTROM.

BGGE-NTR C HUOK. APPLICATION r1 SEPT. 28, 1912.

1,056,476. Patented Mar. 18, 1913.

2 SHEETS-SHgET lv ammo;

I F'rad-Afwzmntmsfrom F. A. WBNNERSTROM.

EOOENTB IG CHUCK. APPLICATION FILED BEPT.28, 1912.

2 SHEETS-SHEET 2.

Patented Mar. 18, 1913.

FREDERICK A. WE NNERSTROM, OF GRAND RAPIDS, MICHIGAN.

EGCENTRIC CHUCK.

Specification of Letters Patent. Application filed September 28, 1912.

Patented Mar. 18,1913. Serial Nb. 722,805.

To all whom it may concern: I

Be it known that I, FREDERICK A. VVEN- NERSTROM, a citizen of the United States of America, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improve,- ments in Eccentric-Qhucks; and I do hereby declare the following to be a full, clear, and exact description of'the invention, such as will enable others skilled in the art to which it appertains to make and use the same. v

My invention relates to improvements in eccentric chucks, and'itsobject is to provide the same with various new and useful features hereinafter more fully described, and particularly pointed-out inthe claims. My invention consists essentially of a bed plate adapted to be mounted on a lathe spindle and provided with transverse ways, acarriage slidable in the ways, a screw to adjust the carriage, locking means to secure the carriage in place, a rotative holder mounted onthe carriage, a screw to rotate the same, a chuck mounted on the rotative holder and a clamping band to hold said holder and chuck securely and rigidly in adjusted position, and in various details of construction and arrangement, as will more fully appear by reference to the accompanying drawings, in which:

Figure 1 is a side elevation of a device embodyingmy invention broken away to show a vertical section of the'main features of the device. Fig. 2 is a vertical transverse section on the line 2-2 of Fig. 1. Fig. 3 is the same on the line 3-3 of Fig." 1. Fig. 4 is a detail at right angles to Fig. l of the locking means for the carriage. Fig. 5 is a perspective detailof a portion of the same on an enlarged scale.

Like numbers refer to like parts in all of the figures.

1 represents a bed plate having a central opening 2 to receive the screw threaded end of a lathe spindle, whereby the bed plate is mounted on the same. 3 are parallelgro ovcs in the bed plate spaced apart and extending in a plane at right angles to the axis of rotation of the device. a

4 is. a carriage mounted on the bed plate 1 grooves in the opposite and having tongues to slidably fit the grooves 3. I f 5 is a screw mounted on the bed plate-2 extending through a screwthreaded lug t'f in the carriage; whereby the carriage is adjusted on the bed platetransversely of the axis of rotation. To retain the carriage in place on the bed plate, strips 14 are secured to the bed plate and extend inward into v sides of the carriage andopposite the ways of the same. I

To look the carriage in adjusted position'a" locking segment 1.5 is provided which is sub-.

stantially semi-circular in form and slidable in a semiecircular recess in the'carriage. One end of thls segment projects outside of the retaining strip 14 and is engagedby'a cam.

lever 17 pivoted onthe carriage whereby this end of the segment is forced inward and the other end of the same moved outward, due' to its semi-circular form. The outwardly movable end is adapted 'to engage an undercut channel in the bed plate along the outer side of the groove 3 therein. -This segment when engaged by the cam lever will be forced against the bottom of the under-cut channel and. will crowd the tongucinto the groove, and thus securely and 'rigidlyhold the car; riage in place. Rotative in the carriage is a chuck carrier 7 onwhich the chuck 10 .is mounted. This carrier is provided with a wormgear 9 engagedby a screw 8 mount ed in the carriage whereby the carrier may be rotatively adjusted.

To securely lock the carrier and chuck in adjusted position the carriage is provided with a conical surface 11. Attached to the chuck is a clamping band 12 divided atopposite sides and provided with binding screws 13, and secured to the chuck by a circumferential tongue and groove, and having an over-hanging portion surrounding and engaging the conical surface 11 whereby as the band is tightened it draws the chuck and carrier firmly againstthe carriage and securely holds the same in adj ust- .ment. Y

By means of the locking means described the carriage is rigidly held in place by the locking segment, and by means of the clamping band and conicalseat for the same the carrier and chuck are also rigidly held, the

resultbeing that while the chuck is adjustable transversely 'to -the' axis of rotation and also'adjustable about its own axis it isalso rigidly held to effectively perform its function of holding the work.

What I claim is: 1. An eccentric chuck, comprising a bed plate, a carriage slidable on the bed plate, a carrier rotative on the carriage, a chuck mounted on the carrier, means for adjusting the carriage, means for rotating the'carrieiy means for locking the carriage on the bed plate, and means for locking the holder and chuck in place on the carriage.

2; An eccentricchuck, comprising a bed plate adapted to be mounted on a lathe spinle, and having parallel grooves, a carriage having. tongues slidable inthe grooves, an under-cut channel in the bed plate, a seg ment slidable ina curved recess in the carriage and 'having'one end to enter said under-cut groove, acam lever mounted on the carriage to engage the other end of the seg I late also having an under-cut channel adacent to one of the grooves, a substantially semi-circular segment slidable in a concave recess in the carriage, one end of which segment enters the llIldQll-Cllt groove, and a cam lever engaging the other end of th'esegment to force the same into the groove.

4. An eccentric chuck, comprising a bed plate, a carriage adjustable on the bed plate,

means for locking the carriage, a carrier rotative in the carriage'a'nd having a Worm Copies of this patent may be obtainefl for gear a screw engaging the gear to rotate the carrier,- a chuck mounted on the holder, a

clamping band attached to the chuck and engaging the carriage to lock the carrier in place. 5. An eccentric chuck, comprisingfabe plate, a carriage adjustable on the bed 'plate, means for locking the carriage in place, a

carrier rotative 1n the carriage, a conical bearing surface on the carriage, a chuck mounted on the carriage and a clamping band attached to the chuck andhaving an inclined surface engaging the said conical place on the carriage.

6. An eccentric chuck, comprising a bed plate having parallel ways, a carriage slidable in the ways, a substantially semi-circular segment slidable in a, concave recess in the carriage and having one end engaging the bed plate, and means for forcing the other end of the segment inward, whereby the carriage is clamped in place by the segment.

7. An eccentric chuck, comprising a bed plate, a carriage adjustable on the bed plate, a carrier rotativein the carriage, means for adjustingthe carriage and the carrier, a conical surface on the carriage surrounding the carrier, a chuck mounted on the carrier and a clamping band divided into two equal parts and connected by binding screws; said band having tongue and groove connection with the chuck, and also having a conical surface engaging the conical surface on the carriage, to clamp the chuck and carrier in place.

In testimony whereof I afiix my signature in presence of two witnesses.

FREDERICK LJVENNERSTROM.

Witnesses:

HAROLD O. VAN Anrwnnr, LUTHER V. MoUL'roN.

five cents each, by addressing the Commissioner of latents, Washington, D. G. i

surface to clamp the carrier and chuck in 

